There...are...THREE...lights!

Sorry, trying to channel my best Capt. Picard. There are three sources of light in the scene, Not just the one. The sun, the earth, and the ground. The earth and moon, of course, are reflected sunlight And if you're wondering where the earth is, look in the reflection on the helmet visor. It's coming up in front of him and on the horizon, behind whoever took that shot..